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\"\"));\n rows.push(row);\n }\n return rows;\n}\n\nasync function loadStaticData(): Promise<{\n routeMap: Record;\n stopCodeToId: Record;\n}> {\n try {\n const cached = await blob.getJSON(CACHE_KEY) as\n | {\n routeMap: Record;\n stopCodeToId: Record;\n fetchedAt: number;\n }\n | undefined;\n if (cached && Date.now() - cached.fetchedAt < CACHE_HOURS * 3600 * 1000) {\n return { routeMap: cached.routeMap, stopCodeToId: cached.stopCodeToId };\n }\n } catch {\n // no cache yet\n }\n\n const res = await fetch(STATIC_GTFS_URL);\n if (!res.ok) throw new Error(`Static GTFS fetch failed: ${res.status}`);\n const buf = await res.arrayBuffer();\n const zip = await JSZip.loadAsync(buf);\n\n // Routes: route_id -> route_short_name\n const routesFile = zip.file(\"routes.txt\");\n if (!routesFile) throw new Error(\"routes.txt not found\");\n const routesText = await routesFile.async(\"text\");\n const routeMap: Record = {};\n for (const row of parseCsvFile(routesText)) {\n if (row.route_id) {\n routeMap[row.route_id] = row.route_short_name ?? row.route_id;\n }\n }\n\n // Stops: stop_code -> stop_id\n const stopsFile = zip.file(\"stops.txt\");\n if (!stopsFile) throw new Error(\"stops.txt not found\");\n const stopsText = await stopsFile.async(\"text\");\n const stopCodeToId: Record = {};\n for (const row of parseCsvFile(stopsText)) {\n if (row.stop_code) stopCodeToId[row.stop_code] = row.stop_id;\n }\n\n await blob.setJSON(CACHE_KEY, {\n routeMap,\n stopCodeToId,\n fetchedAt: Date.now(),\n });\n return { routeMap, stopCodeToId };\n}\n\nexport default async function (req: Request): Promise {\n try {\n const { routeMap, stopCodeToId } = await loadStaticData();\n\n // Try a few formats of your stop code, in case of leading zero differences\n const candidates = [STOP_CODE, STOP_CODE.replace(/^0+/, \"\")];\n let realStopId: string | undefined;\n for (const c of candidates) {\n if (stopCodeToId[c]) {\n realStopId = stopCodeToId[c];\n break;\n }\n }\n\n const url = new URL(req.url);\n const debugMode = url.searchParams.get(\"debug\") === \"1\";\n\n if (!realStopId) {\n return Response.json({\n error: \"Could not find stop_id for that stop_code in static data\",\n stopCode: STOP_CODE,\n totalStopCodesKnown: Object.keys(stopCodeToId).length,\n sampleStopCodes: Object.keys(stopCodeToId).slice(0, 10),\n }, { status: 404 });\n }\n\n const res = await fetch(FEED_URL);\n if (!res.ok) {\n return Response.json({ error: `Feed fetch failed: ${res.status}` }, {\n status: 502,\n });\n }\n\n const buffer = await res.arrayBuffer();\n const feed = GtfsRealtimeBindings.transit_realtime.FeedMessage.decode(\n new Uint8Array(buffer),\n );\n\n const now = Date.now() / 1000;\n const results: { route: string; minutesAway: number }[] = [];\n\n for (const entity of feed.entity) {\n const tripUpdate = entity.tripUpdate;\n if (!tripUpdate || !tripUpdate.stopTimeUpdate) continue;\n\n const rawRouteId = String(tripUpdate.trip?.routeId ?? 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